Onother PI-1 question

[Anonymous]

Hi Everyone,
I appreciate your answers to my questions. I just have a couple more. I'm not that great with electronics so please bare with me. I am interested in building the PI-1 option 1. On the parts layout there is a block under R41 and between Q6 & Q7, what is it and its value. Also I could not find any reference to C11 that IS on the parts layout and NOT on the parts list. Help!!!
Regards,
Dennis

 

[Anonymous]

Hello
C11 seems to be a 15 pf as you can see on the drawing.
About the block under R41, you can see two point on the drawing but i don't see for what ???
I'm waitiing for the end of the texte from CARL: perhaps he will explain this.
Bye Bye
Philippe

 

[Anonymous]

Hi Dennis
A hint for you. Post your (next) question(s) regarding the PI-1 in the Geotech Forum. Because there are the people who built the project and you can ask Carl direct.
Chris

 

[Anonymous]

Hi,
This is where Carl hangs out as well and actually learned from Eric to be able to design the PI-1. You can see from this post that Eric very generously offered up several points that make a huge difference in the design before Carl finalized it. I guess we all owe Eric when it comes to PI designs though.
http://www.findmall.com/metal/school1/config.pl?read=3214
FJ

 

[Anonymous]

C11 can be omitted, it is for experimentation with bandwidth. If you have an "Option 1" schematic that shows C11, then it is very old. I recommend you get the newest version.
I guess the block under R41 is the one labeled J1? That's the audio jack.
- Carl

 

[Anonymous]

Thanks Carl